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Intro to Superposition

The law of superposition states that in undisturbed layers of rock, the oldest layers are at the bottom and the youngest are on top. For instance, if layer 11 has been dated at 65 million years old, possible ages for layer 12 could include options like 100 million years ago or 1.34 billion years ago. This principle helps geologists understand the relative ages of geological layers. Furthermore, if layer 3 is dated at 2.3 billion years old, we can infer that layers 1 and 2 must be younger than this layer.

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Intro to Superposition

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  1. Intro to Superposition

  2. The law of superposition says that if none of the layers have been disturbed, the top layer is youngest and the bottom layer is the oldest.

  3. 1. Geologist have dated layer 11 to be 65 million years old. What possible age can layer 12 be? • A – 100 MYA • B – 10 MYA • C- 234.5 MYA • D – 1,342 MYA

  4. 2. What element would we probably find between layers 11 & 12?

  5. 3. If layer 3 is dated to 2.3 billion years ago, what can we say about layers 1 & 2?

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